I was trying to make some avatars out of some of my images and needed to resize them. I did so in Preview in Yosemite 10.10.3, and had before as well in Snow Leopard. There was no 'save as' option, so I did not save my changes because I didn't want to permanently alter my image. There was no 'undo' feature or 'cancel without saving changes' option either. What gives with this? I can't go back and take that picture again and now it is a low-res grainy mess when I try to resize it to original manually.
MacOS – Changes to image are permanent without hitting save
macospreview
Related Solutions
The answer is simple (and very Apple-like!).
Simply close all extra desktops until you only have one desktop. (To do this, go to Mission Control, hold down alt and click the crosses which appear on unwanted desktops).
Then change the desktop background for the one remaining desktop.
Now any new desktops you create will inherit the background of that first desktop.
This works for me on Mountain Lion:
Open all the JPG's in Preview so that the files are selectable within the one window, i.e. thumbnails of the JPG's are viewable in the selection pane located the window's left side.
Click in the selection pane and select all the thumbnails with Cmd-A.
Select File > Print... from the menu bar.
Select PDF > (from the drop down) Save as PDF... from within the Print Dialog.
Take it from there...
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Best Answer
Changes to files are saved automatically when you close, or automatically in the background.
If you don't want to alter the original image, duplicate it first with ⇧⌘S (File → Duplicate), or use ⌥⇧⌘S Save as… (File → ⌥Save as…).
To revert to the original version, open the file and choose File → Revert To and select a revision.